在安装有多个版本jdk的Linux环境中切换jdk版本

来源：互联网发布：投影仪网络连接很慢编辑：程序博客网时间：2024/05/22 06:45

参考自:
Oracle Linux : Switching Back To Previous Version of openjdk (Doc ID 2056238.1)

[root@localhost ~]# java -versionjava version "1.7.0_79"------------->>>注意此处的1.7版本OpenJDK Runtime Environment (rhel-2.5.5.4.el6-x86_64 u79-b14)OpenJDK 64-Bit Server VM (build 24.79-b02, mixed mode)[root@localhost ~]# which java/usr/bin/java[root@localhost ~]# uname -aLinux localhost.localdomain 2.6.32-573.el6.x86_64 #1 SMP Wed Jul 1 18:23:37 EDT 2015 x86_64 x86_64 x86_64 GNU/Linux[root@localhost ~]# cat /etc/redhat-release Red Hat Enterprise Linux Server release 6.7 (Santiago)[root@localhost ~]# rpm -qa | grep -i openjdkjava-1.6.0-openjdk-1.6.0.35-1.13.7.1.el6_6.x86_64java-1.7.0-openjdk-1.7.0.79-2.5.5.4.el6.x86_64[root@localhost ~]# [root@localhost ~]# update-alternatives --config javaThere are 2 programs which provide 'java'.  Selection    Command-----------------------------------------------*+ 1           /usr/lib/jvm/jre-1.7.0-openjdk.x86_64/bin/java   2           /usr/lib/jvm/jre-1.6.0-openjdk.x86_64/bin/javaEnter to keep the current selection[+], or type selection number: 2 ----->>敲入2,然后回车[root@localhost ~]# which java/usr/bin/java[root@localhost ~]# java -versionjava version "1.6.0_35"------------->>>注意此处的1.6版本OpenJDK Runtime Environment (IcedTea6 1.13.7) (rhel-1.13.7.1.el6_6-x86_64)OpenJDK 64-Bit Server VM (build 23.25-b01, mixed mode)[root@localhost ~]# rpm -qa | grep -i openjdkjava-1.6.0-openjdk-1.6.0.35-1.13.7.1.el6_6.x86_64java-1.7.0-openjdk-1.7.0.79-2.5.5.4.el6.x86_64[root@localhost ~]# [root@localhost ~]# su - oracle  -------->>>切换到oracle用户[oracle@localhost ~]$ java -versionjava version "1.6.0_35"------------->>>注意此处的1.6版本OpenJDK Runtime Environment (IcedTea6 1.13.7) (rhel-1.13.7.1.el6_6-x86_64)OpenJDK 64-Bit Server VM (build 23.25-b01, mixed mode)[oracle@localhost ~]$

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